21（）

单项选择题There have been some insensible people who attempt to end their pains () through suicide.

A. by and large
B. once for all=forever
C. heart and soul
D. on the whole

单项选择题The crisis over parliamentary election illustrated the unpredictable () that events could take once the coalition troops are withdrawn.

A. process
B. line
C. way
D. course